I have been involved in track and field since I was 14 years old, and in my old age from 30 years old onwards. Until today, at 50+, I have covered long distances and ran in the mountains. I have worn almost all brands except for ON. Well, it has a sturdy construction, excellent build quality, impeccable stability, great grip, and amazing slip resistance. The problem is my size, which is around 41.5. Unfortunately, size 42.5 was insufficient. The fit is particularly narrow. I recommend going up 1.5 sizes. Good routes, enjoy your running experiences, it's wonderful